Method of and system for producing great draft in spinning



Feb. 25,1930. GMlNDER 1,748,712

METHOD OF AND SYSTEM FOR PRODUCING GREAT DRAFT IN SPINNING Filed Jan. 51, 1929 lllllllllllllllllllllllll ||||||||||||||li||||||| JlzVflZfl IH| |lllllllll|llll||lll imblalflllldej lllllll Q, 7M *W 017159;

Patented Feb. 25, 1930 UNITED, STATES PATENT OFFICE EMIL GMINDER, OF REUTLINGEN, GERMANY METHOD AND SYSTEM FOR PRODUCING GREAT DRAFT IN SPINNING Application filed. January 31, 1929, Serial No. 836,545, andin Germany January 31, 1928. A I Y My invention relates to improvements in the method of and system for producing great draft in spinning. Preparatory spinning of the yarn is expensive, and it gives rise to non-uniform products. Therefore, it has been tried to dispense with preparatory spinning and thus to render the spinning operation more simple and more satisfactory. For example, it has been tried to produce fine yarn with high draft directly from card sliver or drawing frame sliver. However, when subjecting the roving to high draft, the fibre material is liable to be spread apart, which objection is observed even withshort and soft fibre material, such as cotton, and which is said rear rollers by the front rollers is ca-.

pable to slip between the rear rollers, as distin uished from drawing frames in which hot pairs or a plurality of pairs of rollers are in pressing engagement with the roving so that the fibre material can not'slip between the rear rollers, a false twist being imparted to the roving by means of a false twist device disposed between the drawing frames. The

said false twist device'fiiay consist for example of a rotary tubular member for imparting torsion to the roving, rubbers, or

the like. I wish it to be understood that any 40 known or preferred drawing frame of the t pe indicated may be provided in connection with the twist device. For the purpose of explaining the'invention two examples embodying the same have been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawings,

Fig. 1, is a diagrammatical elevation show- 4 ing my improved system, the apparatus for imparting a false twist to the roving being in the form of a rotary tubular member,

Fig. '2, is a longitudinal section through the false twist device illustrated in Fig. 1,

Figs. 3 and 4, are respectively an eleva- 66 tion and. an end view showing a pair of rollers used in the drawin frame and permitting slipping of the roving, and Fig. 5, is a diagrammatical elevation showing a modification suitable for fibre material of great length. i

In the example shown in Figs. 1 to 4, the roving a is passed through two drawing frames each indicated as a whole by the characters I and II and a false twist device if disposed between the same. The drawing frames I and II may have any known or preferred construction. As shown in the figures, between two pairs of rollers A, B and C, D or A, B and C D there is a pair of rollers permitting slipping of the fibre material and consisting of porcupin rollers R, J and R J It will be un erstood that the circumferential velocity of the rollers C, D and C .D exceeds that of the rollers A, B and A B The porcupine rollers R, J and R J have a combing action. As appears more particularly-from Figs. 3 and 4, the rollers permitting the slipping of the fibre material consist of a roller R provided with longitudinal ribs 1' and grooves '22 and a porcupine roller J provided circumferentially with a large number of sets of spikes or needles n, the needles of the circumferential sets being disposed equal distances apart and so that axial rows of needles are produced, as is shown in Fig. 4, the pitch of the circumferential needles being equal to the pitch of the ribs 1' and grooves '1 so that the longitudinal rows 0 needles and the depressions 'v are in engagement with each other, as is best shown in Fig. 3. As the roving passes throu h the first drawim frame Ithe rear pair 0 rollers A, B lags behind the front rollers C,'D, so that the fibres are drawn through the needles n and brought into proper position relatively to each other. From the first drawing frame I the roving is passed through the false twist device. As shown, the said false twist device consists v of a member t having a funnel-shaped por- 3 ber 25 and point t bein disposedin a bushing t rotatably mounted in a ring t and carrying a grooved pulley t adapted to be rotated by means of a cord at. In lieu of the apparatus showminFigs. 1 and 2 any known or preferred false twist device may be used, and any known or preferred drawing device I and II may be provided in lieu of the construction shown in Fig. 1. From the false twist device if the roving is supplied to the second drawing frame II the construction of which may be the same as that of the frame I. The drawing frame II may be succeeded by a second false twist device and a further drawing frame.

For spinning comparatively long fibre material such as best the distance between the first drawing frame I and the second drawing frame II is comparatively large. In such cases I prefer to ,use the general arrangement shown in Fig. 5. As shown in the said figure, the false twist device consists of a pair of rubber bands 9 and g engaging the roving from opposite sides and movingin opposite directions. The roving a is. passed between a feed roller F and a roller A and thereafter between the roller A and a roller B From the rollers A 13 it is passed between -rollers R J similar in construction to the rollers shown in Figs. 3 and 4, and thereafter between rotaryrollers A513 having a circumferential velocity greater than that of the rollers C", D. Thereafter the roving is passed through the rubber bands 9 g and a false twist is imparted thereto by the said band s moving in opposite direction and in engagement with therovin'g. At

the rear of the apparatus-for producing a false twist the band a is passed into the second drawing frame II. In the construction shown in Fig. 5 the roving is npw turned laterally away from its direction, for which purpose the roller B of the second drawing apparatus is used for directing the roving laterally, the roving being pressed on the roller B by a subsidiary roller F The roving is now passed between the roller B and a roller A, the pair of rollers R, J and a pair of rollers D, C havin a circum-- ferential velocity greater than t at of the rollers B A. 1 I

I claim: a

1. The herein described method of imparting high draft to rovings, which consists in passing the roving between successive drawing frames each includi members permitting slipping of the fi re material and througha false twist device disposed between the said drawin frames.

2. The herein lescribed method of imparting draft to rovings, which consists the said drawing ing frames-each including a pair of rollers permitting slipping of the fibre material and through a false twist device disposed between ames.

3. An apparatus for drawing rovings, comprising a pair of drawing frames each provided with members in loose'engagement with the rollers permitting slipping of the fibre material, and a false twist device disposed between said frames.

'4. ,An apparatus for drawing rovings, comprising a pair of drawing frames each provided with a pair of rear rollers in loose engagement with the rollers permitting slipping of the fibre material, and a false twist device disposed between said frames.

In testimonywhereof I hereunto aifix my signature.

' EMIL GMINDER. 

